DDS-2A Local Generator Unit

THE AOR DDS-2A External VFO for Collins KWM-2(A), 75-S( ) and 32-S( )

General Description

The DDS-2A is a micro-processor controlled external VFO for the Collins
KWM-2(A) and S-Line, including 75S-3B and 32S-3. The DDS-2A uses the latest
DDS and PLL technology to produce accurate and clean local signals for the
equipment. The unit utilizes an original BFO of 435.65 kHz (456.35 kHz)
in the Collins equipment.

The DDS-2A replaces PTO and HFO in the equipment. You can expect 10 Hz
frequency resolution and accuracy in the transmit and the receive.

Because of the clean local injection, you can expect performance
improvement, including inter-modulation and cross-modulation characteristic.

HFO Features

The DDS-2A provides an HFO (Heterodyne Frequency Oscillator) signal in the
range of 6.550 MHz to 32.950 MHz (5 kHz off the original range) in 200 kHz
increments.

The signal replaces the HFO oscillator of the equipment thereby general
coverage is possible. You can operate your equipment in a new WARC bands,
as well as to receive short-wave broadcast stations.

The HFO output is produced by the low-noise PLL with reference frequency
of 50 kHz.

VFO & 100 Memory Channel

The DDS-2A provides VFO signal of 2.695 MHz to 2.495 MHz (5 kHz off the
original range) that will replace the PTO of the equipment. The VFO output
can be adjusted in 10 Hz increment.

The VFO uses an NCO (Numeric Controlled Oscillator) within a PLL loop that
provides excellent C/N and accuracy over the range.

Total of 100 memory channels are provided for instant access to the
important frequencies. A=B and split operation are also included for the
VFO function.

BFO Shift compensation

The DDS-2A provides BFO shift compensation to obtain accurate frequency
display. A 455 kHz of the reference frequency can be compensated up to
9.999 kHz in 1 Hz steps for both the USB and the LSB. (Example; 1.350
kHz of the Collins original frequency)

Computer control

Standard RS-232C port is provided for remote control through the PC's
COM port.

Easy installation

The DDS-2A can be installed to the KWM-2(A) without any modifications
to the equipment. It can also be installed to the S-Line (75S- / 32S- )
with the modification to the 75S-( ) receiver. The DDS-2A uses a inch-size
optical encoder for the VFO dial, so you can replace the knob to an original
Collins spinner knob.

DDS-2A SPECIFICATIONS

General Description

The DDS-2A is a micro-processor controlled external VFO for the Collins
KWM-2(A) and S-Line, including 75S-3B and 32S-3. The DDS-2A uses the latest
DDS and PLL technology to produce accurate and clean local signals for the
equipment. The unit utilizes an original BFO of 435.65 kHz (456.35 kHz)
in the Collins equipment.

The DDS-2A replaces PTO and HFO in the equipment. You can expect 10 Hz
frequency resolution and accuracy in the transmit and the receive.

Because of the clean local injection, you can expect performance improvement,
including inter-modulation and cross-modulation characteristic.

HFO Features

The DDS-2A provides an HFO (Heterodyne Frequency Oscillator) signal in the
range of 6.550 MHz to 32.950 MHz (5 kHz off the original range) in 200 kHz
increments.

The signal replaces the HFO oscillator of the equipment thereby general
coverage is possible. You can operate your equipment in a new WARC bands,
as well as to receive short-wave broadcast stations.

The HFO output is produced by the low-noise PLL with reference frequency
of 50 kHz.

VFO & 100 Memory Channel

The DDS-2A provides VFO signal of 2.695 MHz to 2.495 MHz (5 kHz off the
original range) that will replace the PTO of the equipment. The VFO output
can be adjusted in 10 Hz increment.

The VFO uses an NCO (Numeric Controlled Oscillator) within a PLL loop that
provides excellent C/N and accuracy over the range.

Total of 100 memory channels are provided for instant access to the
important frequencies. A=B and split operation are also included for the
VFO function.

BFO Shift compensation

The DDS-2A provides BFO shift compensation to obtain accurate frequency
display. A 455 kHz of the reference frequency can be compensated up to
9.999 kHz in 1 Hz steps for both the USB and the LSB. (Example; 1.350
kHz of the Collins original frequency)

Computer control

Standard RS-232C port is provided for remote control through the PC's
COM port.

Easy installation

The DDS-2A can be installed to the KWM-2(A) without any modifications to
the equipment. It can also be installed to the S-Line (75S- / 32S- )
with the modification to the 75S-( ) receiver. The DDS-2A uses a inch-size
optical encoder for the VFO dial, so you can replace the knob to an original
Collins spinner knob.